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Dictionary

plu•to•nism

Pronunciation: (plOOt'n-iz"um), [key]
—n. Geol.
1. the intrusion of magma and associated deep-seated processes within the earth's crust.
2. (often cap.) the disproven theory that all rocks formed by solidification of a molten mass, promulgated by Scottish geologist James Hutton (1726–97).

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

plutonic

plutonium

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